Speed limits in Australia range from shared zones to . Speed limit signage is in km/h since metrication on 1 July 1974. All speed limits (with the sole exception of the South Australian school and roadworks zones which are signposted at 25 km/h) are multiples of 10 km/h – the last digit in all speed signs is zero. Speed limits are set by state and territory legislation albeit with co-ordination and discussion between governments. Common limits Australian states and territories use two "default" speed limits. These apply automatically in the absence of 'posted' speed restriction signage. The two default speed limits are: within built-up areas, , except for the Northern Territory which remains at outside built-up areas, ; two exceptions are Western Australia and the Northern Territory at Common speed zones below the default built up area 50 km/h limit are: Shared zones (signposted areas where pedestrians and motorised traffic share the same space) are . School zones are variable speed zones, with a limit applying during gazetted school terms (which may include pupil-free days) and at specific times of the day when children are expected to be present. In South Australia, the limit is . A minority of school zones have flashing lights to indicate when the lower speed limit applies. In Western Australia, every school has a flashing speed zone sign, most of which are solar powered. 40 km/h zones. A number of local governments have implemented lower speed limits, typically 40 km/h, in certain areas, such as shopping precincts, whole suburbs such as Balmain and Rozelle in Sydney, or areas with high pedestrian activity. Common speed zones above the default limits are: Many sub-arterial roads are zoned . Major connector roads and smaller highways are zoned , , or . Some highways and freeways are zoned . Most of the Stuart, Arnhem, Barkly and Victoria highways in the Northern Territory are zoned . The "END" speed limit sign is increasingly used throughout Australia to signal the end of a posted speed restriction, or built-up area "default" speed-limit leading to the jurisdiction's "rural" default speed limit. It contains the word "END" and a number in a black circle beneath this, representing the ceasing speed-limit. It is typically used where, according to AS1742.4 the road beyond has certain hazards such as hidden driveways, poor camber, soft edges and other hazards where the road authority feels a posted speed limit